Malicious PDF — malware analysis report

Static analysis result for SHA-256 db64357d5705d645…

MALICIOUS

PDF

84.2 KB Created: 2021-03-30 05:11:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ad2e82294581b4f36c51e8086b484c7d SHA-1: 24a26709a957e498fc211969116fee358335a87e SHA-256: db64357d5705d645e933796fa38aeae214e5e4c6de71fa923ef16d602a71310d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains multiple embedded URLs, with a primary focus on directing users to 'dugedepap.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is part of a link farm designed to distribute malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely to phish or deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dugedepap.ru/award?keyword=basic+english+conversation+in+interview+pdf PDF link annotation
    • http://bufo.online/12250921685dah7g.pdfIn PDF document text
    • http://mavisuvegepufi.iblogger.org/22148340290.pdfIn PDF document text
    • https://noxerurivago.weebly.com/uploads/1/3/4/7/134767941/9345861.pdfIn PDF document text
    • https://simiwulizolur.weebly.com/uploads/1/3/1/4/131455232/c61472bcc.pdfIn PDF document text
    • http://medolufinumul.sportsontheweb.net/bactris_gasipaes.pdfIn PDF document text
    • http://copyright-services-us.com/30435707036wulga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463286/normal_604685bf08be2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426090/normal_5ff41d67486bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455194/normal_6016fc92b2ae7.pdfIn PDF document text
    • http://kiparegazeratax.getenjoyment.net/paper_chromatography_notes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452392/normal_5ff9c91fd07ce.pdfIn PDF document text
    • http://reform-st.ru/the_sims_freeplay_apk_mod_obbv87h9.pdfIn PDF document text
    • http://septiki-rf.website/755419568237tsha.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463002/normal_605442d4b3984.pdfIn PDF document text
    • https://fupopafesuz.weebly.com/uploads/1/3/4/4/134443157/25732925883c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/analogy_worksheets_for_5th_graders.pdfIn PDF document text
    • http://bewebumaxof.epizy.com/47990429343.pdfIn PDF document text
    • http://vorisenunajix.myartsonline.com/60171639019.pdfIn PDF document text
    • http://womefobusefox.rf.gd/livre_pour_apprendre_a_parler_l_anglais.pdfIn PDF document text
    • https://s3.amazonaws.com/gekojulog/bazaar_2018_movie_full_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/maxamegabosofewaxe.pdfIn PDF document text
    • https://s3.amazonaws.com/tosego/vision_classroom_management_software_free.pdfIn PDF document text
    • http://sutexuvidag.myartsonline.com/mustang_2070_skid_steer_parts_manual.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAD 5620 bytes
SHA-256: 9fa6b9108f63d03a1d83dca32fde62ee601f3f9b30eb507c90822843cdae38fd
font_01_sfnt_off00011dd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD9 10948 bytes
SHA-256: 6a228ac6bbe37877809fcbb9d30056e5ff4a1ac2d894f178c6fc5fce350c5aa4

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